Be–Ti phases

11 phases (tier A 5, tier C 1, liquid 1, needs_review 4); 10 stable in a calculated diagram. Structure types are assigned only when the stored evidence supports an assignment under the stated tier rules (tier A: standard phase name; tier B: unique Materials Project + OQMD on-hull match, DFT-supported; tier C: one structure stated by the assessment's crystallographic table, assessor-stated); other phases list candidates and are marked needs_review. Stability is from phase diagrams calculated with pycalphad from the SGTE binary collection (evidence class: model).

Data: interactive registry · full JSON · Be–Ti system page · Markdown · field reference

Phases of the Be–Ti system (11)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
BCC_B2 phase:be-ti:bcc-b2	CsCl · B2 · cP2 · Pm-3m (221)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 1074.19–2499.73 K, x(Ti) 0–1	4	1
BE10TI phase:be-ti:be10ti		needs_review	stable in 1 of 1 calculated diagram(s): 300–1890.42 K, x(Ti) 0.09091–0.09091	0	1
BE12TI_D2B phase:be-ti:be12ti-d2b	Mn12Th · D2_b · tI26 · I4/mmm (139)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1839.94 K, x(Ti) 0.07692–0.07692	0	1
BE13TI2 phase:be-ti:be13ti2		needs_review	stable in 1 of 1 calculated diagram(s): 300–1832.99 K, x(Ti) 0.13333–0.13333	0	1
BE17TI2 phase:be-ti:be17ti2		needs_review	stable in 1 of 1 calculated diagram(s): 300–1939.92 K, x(Ti) 0.10526–0.10526	0	1
BE2TI_C15 phase:be-ti:be2ti-c15	Cu2Mg · C15 · cF24 · Fd-3m (227)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1620.24 K, x(Ti) 0.33333–0.33333	0	1
BE3TI phase:be-ti:be3ti	Ni3Pu · hR12 · R-3m (166)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–1730.52 K, x(Ti) 0.25–0.25	0	1
BE5TI4 phase:be-ti:be5ti4		needs_review	stable in 1 of 1 calculated diagram(s): 300–1457.9 K, x(Ti) 0.44444–0.44444	0	1
FCC_A1 phase:be-ti:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	not stable in 1 calculated diagram(s)	0	1
HCP_A3 phase:be-ti:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1729.16 K, x(Ti) 0–1	0	1
LIQUID phase:be-ti:liquid	liquid	liquid	stable in 1 of 1 calculated diagram(s): 1250–2500 K, x(Ti) 0–1	0	1

BCC_B2 (Be–Ti)

Id: phase:be-ti:bcc-b2; status assigned
Structure: CsCl · B2 · cP2 · Pm-3m (221); type st:b2-cscl-cp2; tier A: standard phase name; confidence high
Caveat: partitioned order/disorder model in BeTi-06Tok.tdb also describes the disordered state
Stability: stable in 1 of 1 calculated diagram(s): 1074.19–2499.73 K, x(Ti) 0–1
Literature: 4 values (4 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:be-ti:bcc-b2
paper: paper:10.1361/105497106x92844:TiBe(B2)
tdb: tdb:BeTi-06Tok.tdb:BCC_B2

TDB models of BCC_B2 (1): PHASE and CONSTITUENT statements as written

BeTi-06Tok.tdb: BCC_B2, type code %B, sha256 99382030a5f6684b…

38: PHASE BCC_B2 %B 3 0.5 0.5 3 !
39: CONST BCC_B2 : BE% TI : BE TI% : VA : !

Example references (2 of 2; assessments first):

doi:10.1361/105497106X92844 T. Tokunaga, H. Ohtani, M.Hasebe, J. Phase Equilib. Diffus., 27, 83-91(2006).
assessment that models this phase; reports values for this phase
doi:10.1016/0364-5916(79)90010-5 Larry Kaufman, Lee E. Tanner, Coupled phase diagrams and thermochemical descriptions of the titanium-beryllium, zirconium-beryllium and hafnium-beryllium systems, Calphad 3, 91-107 (1979).
cited as the source of values for this phase

BE10TI (Be–Ti)

Id: phase:be-ti:be10ti; status needs_review
No structure assigned. Why: no_on_hull_entry_in_both; no_structure_token; sgte_mmc2_row_incomplete
Candidate (sgte_mmc2): (Be10Ti) — Hallstedt 2025 mmc2 row for BE10TI: Be10Ti
Stoichiometry: Be 0.9091, Ti 0.0909
Stability: stable in 1 of 1 calculated diagram(s): 300–1890.42 K, x(Ti) 0.09091–0.09091
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:be-ti:be10ti
tdb: tdb:BeTi-06Tok.tdb:BE10TI

TDB models of BE10TI (1): PHASE and CONSTITUENT statements as written

BeTi-06Tok.tdb: BE10TI, type code %, sha256 99382030a5f6684b…

53: PHASE BE10TI % 2 10 1 !
54: CONST BE10TI : BE : TI : !

Example references (1 of 1; assessments first):

doi:10.1361/105497106X92844 T. Tokunaga, H. Ohtani, M.Hasebe, J. Phase Equilib. Diffus., 27, 83-91(2006).
assessment that models this phase

BE12TI_D2B (Be–Ti)

Id: phase:be-ti:be12ti-d2b; status assigned
Structure: Mn12Th · D2_b · tI26 · I4/mmm (139); type st:d2-b-mn12th-ti26; tier A: standard phase name; confidence high
Caveat: DFT agrees: on-hull mp-aaackvgd and oqmd-28706, space group 139
Stoichiometry: Be 0.9231, Ti 0.0769
Stability: stable in 1 of 1 calculated diagram(s): 300–1839.94 K, x(Ti) 0.07692–0.07692
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:be-ti:be12ti-d2b
mp: mp:mp-aaackvgd
oqmd: oqmd:oqmd-28706
tdb: tdb:BeTi-06Tok.tdb:BE12TI_D2B

TDB models of BE12TI_D2B (1): PHASE and CONSTITUENT statements as written

BeTi-06Tok.tdb: BE12TI_D2B, type code %, sha256 99382030a5f6684b…

48: PHASE BE12TI_D2B % 2 12 1 !
49: CONST BE12TI_D2B : BE : TI : !

Example references (1 of 1; assessments first):

doi:10.1361/105497106X92844 T. Tokunaga, H. Ohtani, M.Hasebe, J. Phase Equilib. Diffus., 27, 83-91(2006).
assessment that models this phase

BE13TI2 (Be–Ti)

Id: phase:be-ti:be13ti2; status needs_review
No structure assigned. Why: no_on_hull_entry_in_both; no_structure_token; sgte_mmc2_row_incomplete
Candidate (sgte_mmc2): (Be13Ti2) — Hallstedt 2025 mmc2 row for BE13TI2: Be13Ti2
Stoichiometry: Be 0.8667, Ti 0.1333
Stability: stable in 1 of 1 calculated diagram(s): 300–1832.99 K, x(Ti) 0.13333–0.13333
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:be-ti:be13ti2
tdb: tdb:BeTi-06Tok.tdb:BE13TI2

TDB models of BE13TI2 (1): PHASE and CONSTITUENT statements as written

BeTi-06Tok.tdb: BE13TI2, type code %, sha256 99382030a5f6684b…

64: PHASE BE13TI2 % 2 13 2 !
65: CONST BE13TI2 : BE : TI : !

Example references (1 of 1; assessments first):

doi:10.1361/105497106X92844 T. Tokunaga, H. Ohtani, M.Hasebe, J. Phase Equilib. Diffus., 27, 83-91(2006).
assessment that models this phase

BE17TI2 (Be–Ti)

Id: phase:be-ti:be17ti2; status needs_review
No structure assigned. Why: mp_oqmd_space_groups_differ; no_structure_token; sgte_mmc2_rows_disagree
Candidate (dft_mp): P6_3/mmc (194) — on-hull MP Ti2Be17 at x(TI)=0.1053
Candidate (dft_oqmd): R-3m (166) — on-hull OQMD Be17 Ti2 at x(TI)=0.1053
Candidate (sgte_mmc2): Ni17Th2 · hP38 · P6_3/mmc (194) — Hallstedt 2025 mmc2 row for BE17TI2: Be17Ti2 (high T), see also Th2Zn17
Candidate (sgte_mmc2): Th2Zn17 · hR19 · R-3m (166) — Hallstedt 2025 mmc2 row for BE17TI2: Be17Ti2 (low T), see also Ni17Th2
Candidate (tdb_comment): Ni17Th2 · hP38 · P6_3/mmc — BeTi-06Tok.tdb: 'Prototype Ni17Th2 (hP38, P6_3/mmc), beta'
Candidate (tdb_comment): Th2Zn17 · hR19 · R-3m — BeTi-06Tok.tdb: 'Prototype Th2Zn17 (hR19, R-3m), alpha'
Stoichiometry: Be 0.8947, Ti 0.1053
Stability: stable in 1 of 1 calculated diagram(s): 300–1939.92 K, x(Ti) 0.10526–0.10526
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:be-ti:be17ti2
tdb: tdb:BeTi-06Tok.tdb:BE17TI2

TDB models of BE17TI2 (1): PHASE and CONSTITUENT statements as written

BeTi-06Tok.tdb: BE17TI2, type code %, sha256 99382030a5f6684b…

59: PHASE BE17TI2 % 2 17 2 !
60: CONST BE17TI2 : BE : TI : !

Example references (1 of 1; assessments first):

doi:10.1361/105497106X92844 T. Tokunaga, H. Ohtani, M.Hasebe, J. Phase Equilib. Diffus., 27, 83-91(2006).
assessment that models this phase

BE2TI_C15 (Be–Ti)

Id: phase:be-ti:be2ti-c15; status assigned
Structure: Cu2Mg · C15 · cF24 · Fd-3m (227); type st:c15-cu2mg-cf24; tier A: standard phase name; confidence high
Caveat: DFT agrees: on-hull mp-aaaaaebt and oqmd-10907, space group 227
Stoichiometry: Be 0.6667, Ti 0.3333
Stability: stable in 1 of 1 calculated diagram(s): 300–1620.24 K, x(Ti) 0.33333–0.33333
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:be-ti:be2ti-c15
mp: mp:mp-aaaaaebt
oqmd: oqmd:oqmd-10907
tdb: tdb:BeTi-06Tok.tdb:BE2TI_C15

TDB models of BE2TI_C15 (1): PHASE and CONSTITUENT statements as written

BeTi-06Tok.tdb: BE2TI_C15, type code %, sha256 99382030a5f6684b…

74: PHASE BE2TI_C15 % 2 2 1 !
75: CONST BE2TI_C15 : BE : TI : !

Example references (1 of 1; assessments first):

doi:10.1361/105497106X92844 T. Tokunaga, H. Ohtani, M.Hasebe, J. Phase Equilib. Diffus., 27, 83-91(2006).
assessment that models this phase

BE3TI (Be–Ti)

Id: phase:be-ti:be3ti; status assigned
Structure: Ni3Pu · hR12 · R-3m (166); type st:ni3pu-hr12; tier C: assessor-stated (Hallstedt 2025 crystallographic table); confidence assessor-stated
Structure source: B. Hallstedt, The SGTE collection of binary datasets, Calphad 89 (2025) 102833, supplementary crystallographic table (mmc2) doi:10.1016/j.calphad.2025.102833
Caveat: not certain from the name or DFT alone (dft_space_group_166_matches_2_structure_types, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
Stoichiometry: Be 0.7500, Ti 0.2500
Stability: stable in 1 of 1 calculated diagram(s): 300–1730.52 K, x(Ti) 0.25–0.25
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:be-ti:be3ti
tdb: tdb:BeTi-06Tok.tdb:BE3TI

TDB models of BE3TI (1): PHASE and CONSTITUENT statements as written

BeTi-06Tok.tdb: BE3TI, type code %, sha256 99382030a5f6684b…

69: PHASE BE3TI % 2 3 1 !
70: CONST BE3TI : BE : TI : !

Example references (1 of 1; assessments first):

doi:10.1361/105497106X92844 T. Tokunaga, H. Ohtani, M.Hasebe, J. Phase Equilib. Diffus., 27, 83-91(2006).
assessment that models this phase

BE5TI4 (Be–Ti)

Id: phase:be-ti:be5ti4; status needs_review
No structure assigned. Why: no_on_hull_entry_in_both; no_structure_token; sgte_mmc2_row_incomplete
Candidate (sgte_mmc2): (Be5Ti4) — Hallstedt 2025 mmc2 row for BE5TI4: Be5Ti4
Stoichiometry: Be 0.5556, Ti 0.4444
Stability: stable in 1 of 1 calculated diagram(s): 300–1457.9 K, x(Ti) 0.44444–0.44444
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:be-ti:be5ti4
tdb: tdb:BeTi-06Tok.tdb:BE5TI4

TDB models of BE5TI4 (1): PHASE and CONSTITUENT statements as written

BeTi-06Tok.tdb: BE5TI4, type code %, sha256 99382030a5f6684b…

79: PHASE BE5TI4 % 2 5 4 !
80: CONST BE5TI4 : BE : TI : !

Example references (1 of 1; assessments first):

doi:10.1361/105497106X92844 T. Tokunaga, H. Ohtani, M.Hasebe, J. Phase Equilib. Diffus., 27, 83-91(2006).
assessment that models this phase

FCC_A1 (Be–Ti)

Id: phase:be-ti:fcc-a1; status assigned
Structure: Cu · A1 · cF4 · Fm-3m (225); type st:a1-cu-cf4; tier A: standard phase name; confidence high
Stability: not stable in 1 calculated diagram(s)
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:be-ti:fcc-a1
tdb: tdb:BeTi-06Tok.tdb:FCC_A1

TDB models of FCC_A1 (1): PHASE and CONSTITUENT statements as written

BeTi-06Tok.tdb: FCC_A1, type code %A, sha256 99382030a5f6684b…

27: PHASE FCC_A1 %A 2 1 1 !
28: CONST FCC_A1 : BE TI : VA : !

Example references (1 of 1; assessments first):

doi:10.1361/105497106X92844 T. Tokunaga, H. Ohtani, M.Hasebe, J. Phase Equilib. Diffus., 27, 83-91(2006).
assessment that models this phase

HCP_A3 (Be–Ti)

Id: phase:be-ti:hcp-a3; status assigned
Structure: Mg · A3 · hP2 · P6_3/mmc (194); type st:a3-mg-hp2; tier A: standard phase name; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 300–1729.16 K, x(Ti) 0–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:be-ti:hcp-a3
tdb: tdb:BeTi-06Tok.tdb:HCP_A3

TDB models of HCP_A3 (1): PHASE and CONSTITUENT statements as written

BeTi-06Tok.tdb: HCP_A3, type code %A, sha256 99382030a5f6684b…

43: PHASE HCP_A3 %A 2 1 0.5 !
44: CONST HCP_A3 : BE% TI% : VA : !

Example references (1 of 1; assessments first):

doi:10.1361/105497106X92844 T. Tokunaga, H. Ohtani, M.Hasebe, J. Phase Equilib. Diffus., 27, 83-91(2006).
assessment that models this phase

LIQUID (Be–Ti)

Id: phase:be-ti:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 1250–2500 K, x(Ti) 0–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:be-ti:liquid
tdb: tdb:BeTi-06Tok.tdb:LIQUID

TDB models of LIQUID (1): PHASE and CONSTITUENT statements as written

BeTi-06Tok.tdb: LIQUID, type code %, sha256 99382030a5f6684b…

22: PHASE LIQUID:L % 1 1 !
23: CONST LIQUID:L : BE TI : !

Example references (1 of 1; assessments first):

doi:10.1361/105497106X92844 T. Tokunaga, H. Ohtani, M.Hasebe, J. Phase Equilib. Diffus., 27, 83-91(2006).
assessment that models this phase

Please cite

R. Arróyave, J. Saal, D. Shin, ORCHID-Registry: phase registry of binary systems (version 2026.10; Version 1, machine-extracted), Zenodo (2026). doi:10.5281/zenodo.23735970
R. Arróyave, J. Saal, D. Shin, ORCHID data: umbrella record of the ORCHID datasets (version 2026.10; Version 1, machine-extracted), Zenodo (2026). doi:10.5281/zenodo.23736065

Also cite B. Hallstedt, The SGTE collection of binary datasets, Calphad 89 (2025) 102833, https://doi.org/10.1016/j.calphad.2025.102833 (CC BY 4.0), and the original assessment named in each file; A. Jain et al., The Materials Project: A materials genome approach to accelerating materials innovation, APL Materials 1 (2013) 011002, https://doi.org/10.1063/1.4812323 (CC BY 4.0); J. E. Saal et al., JOM 65 (2013) 1501, https://doi.org/10.1007/s11837-013-0755-4 and S. Kirklin et al., npj Comput. Mater. 1 (2015) 15010, https://doi.org/10.1038/npjcompumats.2015.10 (CC BY 4.0); the original source of every value you use (paper_citation / paper_doi, and cited_dois for values the paper cites from earlier work). Version 1, machine-extracted: values were read by language-model readers constrained to quote their source and checked automatically, and the release was then audited on the printed pages by adversarial audits, an independent second review of fit-facing records and a preliminary human review of a frozen sample. Flags such as accepted and ESPEI-ready record screening results, not certification; known issues are listed in the release notes.

@misc{orchid_phase_registry_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID-Registry: phase registry of binary systems}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23735970},
  url       = {https://doi.org/10.5281/zenodo.23735970},
  note      = {Version 1, machine-extracted}
}

@misc{orchid_data_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID data: umbrella record of the ORCHID datasets}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23736065},
  url       = {https://doi.org/10.5281/zenodo.23736065},
  note      = {Version 1, machine-extracted}
}